-Hits and Misses

4.1 Translation Lookaside Buffer (TLB)

Hits and Misses

If there is a virtual address match, or hit, in the TLB, the physical page number is extracted from the TLB and concatenated with the offset to form the physical address (see Figure 4-1).

If no match occurs (TLB miss), an exception is taken and software refills the TLB from the page table resident in memory. Software can write over a selected TLB entry or use a hardware mechanism to write into a random entry.

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